my buddy has had bad luck with the federal mougal lifters, lasted like 2000 miles. put comp lifters in and no problems. i run comp lifters in all my motors. works just fine.

i believe the lifters void the warenty, but the springs are just a recomendation don't void the warrenty. if i miss read the instructions, then all my cams are void if the cam takes a ****. i use the Z28 spings.

Comp cams had a bad run of heat treated billets allthough you will never here it from them. If you don't break/run the cam in correctly ,any cam but a roller , you will most likely have flat lobe in few thousand miles.
Flat tappet lifters refers to mechanical ie solid lifters then you have hydralic flat tappet and roller lifters.
Lots of good info on Comp cams web page and good description on how to break in a new cam.
Also the cam specs normaly determine which springs you need.
Wes

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